AD7894BR-3

Overview

The AD7894BR-3 is a 14-bit successive approximation analog-to-digital converter housed in an 8-lead SOIC package. It operates from a single +5 V supply and features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The device accepts bipolar input signals ranging from -2.5 V to +2.5 V with a typical power consumption of 20 mW. Key performance specifications include a maximum conversion time of 5 ms, a signal-to-noise ratio of 77 dB minimum, and a differential nonlinearity of ±1.5 LSB. It supports throughput rates up to 160 kHz.

Feature Summary

• Integrated signal scaling circuitry enables direct handling of bipolar analog inputs without external conditioning components.
• Proprietary automatic power-down mode allows the device to enter low-power standby after conversion completion.
• Two-wire serial interface simplifies digital connection by utilizing standard serial clock and data output lines.

Applications

• Battery-powered instrumentation requiring low power consumption
• Portable data acquisition systems
• Industrial process control loops

Procurement Notes

Verify that the specific suffix 'BR' corresponds to the B-version specifications regarding linearity and gain error tolerances. Confirm the operating temperature range aligns with industrial requirements. Ensure the external reference voltage matches the specified +2.5 V nominal value for optimal accuracy. Check pin compatibility if replacing older variants within the same family.

Selection Notes

Select this component when a 14-bit resolution is required alongside a compact 8-lead surface mount footprint. Choose the BR variant over the AR version if tighter integral nonlinearity specifications are necessary for the application. Consider the auto-sleep feature for applications with intermittent sampling requirements to minimize average power usage.

Part Context

This part belongs to the AD7894 series of fast, 14-bit ADCs designed for space-constrained applications. It serves as a pin-compatible upgrade to the 12-bit AD7895, offering higher resolution within the same physical package dimensions. The series includes variants tailored for different input voltage ranges and accuracy grades.

Replacement Considerations

AD7894AR-3Z